ASRock motherboards have CMOS (complementary metal oxide semiconductor) batteries, which power the memory that holds such information as date and time, passwords and drive configurations. If the CMOS memory loses power, this information is lost. CMOS batteries tend to last two to four years and should be replaced regularly. CMOS batteries for ASRock motherboards can be purchased in computer stores and many general merchandise stores that carry a wide variety of watch batteries.
Start the computer and enter the BIOS (basic input/output system) set-up mode by hitting the “F2” key as soon as the computer starts booting up.
Record all settings in the BIOS on each set-up tab.
Turn off the computer and disconnect the power cord.
Remove the case cover from the computer case. This typically involves unscrewing one or two screws and sliding off a part of the case, but this can vary greatly by case design.
Locate the CMOS battery on the ASRock motherboard; the location will vary depending on the motherboard model, but it is usually located within an inch or two of the processor. The battery looks like a watch battery and is held in place by a small metal clip.
Slide the metal clip sideways off the battery and pull the battery from the holder, noting which side of the battery is facing outward.
Place a new battery in the battery holder facing the same direction as the old battery and slide the metal clip over the new battery to hold it in place.
Replace the computer case cover and plug in the power cord.
Start the computer and enter the BIOS set-up mode by hitting the “F2” key as soon as the computer starts booting. Enter and save all the recorded BIOS settings.
The CMOS replacement battery needed will vary by motherboard model. The type needed can be found in the manual or by looking at the battery.